Door-check.



A-H.LONBOM & G.R.RODGERS DOOR CHECK.

APPLICATION FILED APR. 1. 1915.

1,177,642. Patented Apr. 4,1916.

2 SHEETS-SHEET I.

A. H. LONBOM'& G. R. RODGERS.

DOOR CHECK.

APPLICATION FILED APR. 1. 1915.

1,177,642w Patented Apr. 4,1916.

2 SHEETSSHEET 2- QB l AXEL H. LONBOM AND GEORGE R. RODGERS, 0F DANVILLE, ILLINOIS.

DOOR-CHECK.

Specification of Letters Patent. I

Patented Apr. 4, 1916.

Application filed April 1, 1915. Serial No. 18,511.

To all whomit may concern 'Be it known that we. Axel. H. Loxeon and GEORGE'R. RoDoERs,-citizens of the United States, and residents of Danville, in the county of Vermilion and State of Illinois, have invented certain new and useful 1m; provements in Door-Checks, of which the following is a specification.

Our invention relates to door checks and has particular reference to a novel doubleacting floor check and an improved valve for use in connection therewith.

An object in the construction of a doubleacting door check is to provide means preventing the movement of thedoor independent of the check. This result is. secured in the present construction by providing cooperating cams or sliding surfaces, the parts being arrangedwhereby no friction is developed preventing easy opening, but preventing any independent movement of the door with relation to the check, such as might occur in a double-acting device were no equivalent means provided.

A further object is to provide a valve mechanism which shall be exceedingly simple and which may be combined with the common checking rod heretofore employed in devices of this sort.

A general object in the construction of our device is to simplify and cheapen the. cost of door checks, and double-acting checks in particular. 7

The invention will be more readily understood by reference to .the accompanying drawings, wherein: v v

Figure 1 is a vertical section through a door check'constructed in accordance with our invention, Fig. 2 is a transverse horiz'ontal section through the construction shown in Fig. 1, Fig. 3 is a plan view of our check, Fig. 4 is a section on the line 44 of Fig. 1, Fig. 5 is a section on the line 5--5 of Fig. 1. and Fig. 6 is a section on the line 6-6 of Fig. 1.

Referring more particularly to the drawings, it will be seen that we provide two casings 10, 11, the former acting as a guide for the rear end of the piston stem, and the latter acting as a spring containing cylinder. These two casings are threaded and screwed together to provide a fluid tight joint. Each casing is provided with a floor attaching flange 12, 13. The casing 10 provides a chamber having parallel sides 14, which sides are planes and act as a guide for the rear end ofthe piston stem. Floor 15'of this casing likewise performs a similar function. Mounted within the casing 10 is an operat-' 1ng shaft 16, the squared upper end 17 of which is adapted to be engaged by a door, or door operating lever. The lower end 18 of the shaft is seated in a recessed boss It) in the casing. The shaft 16 has a pair of arms secured thereto and at the extremities of these arms we provide anti-friction rolls 20. These rolls operate within arcuate enlargements formed within the casing 10. Also secured to the shaft is a cam 21 having a double face and performing the function of preventing movement of the door independ- I to cooperate with the parts on the shaft 16.

As best shown in Figs. 1 and 2. the stem is enlarged at the point of cooperation with the casing 10, its plane sides being guided by the sides 14 of the casing and its lower portion 24 being guided on the surface 15 of the casing. Within the body of the rear portion of the piston stem we provide an opening'25 which permits the reciprocation of the piston with relation to the shaft. Projecting upwardly from this body portion is a bar or lug 26 having a face 27 with which the antifriction rolls 21 cotiperate to cause the reciprocation of the piston. Also formed as a part ofthe body portion of the rear of the piston stem are the surfaces 28, shaped to correspond to the surfaces 29 on the edge of the member 21. In any position of the parts portions of the surfaces 28 and 29 lie in contact and the door is thereby positively held in proper relation to the checking ele-' ment, the upper portion of the shaft 16 is held in a gland nut 30, which closes-the opening in the casing 10.

The piston 20 is mounted for reciprocation withinthe cylinder 11 and is urged into the position shown in Fig. 1 by a coil. spring 31. This spring at its rear'end has a bearing against a disk 32. seated between' the two casings, and heldin place by 00- operation of the threadedportions of the cut-out portion 35 and the auxiliarycut-out portion 36, shown in dotted lines in Figs. 1, 2 and 6. This auxiliary cut-out registers with a by pass 37 formed in the piston, and the extent of register of the two escape apertures is controlled by the axial position of the rod. The rod is held in the desired location by the screw 38. best shown in Figs. 2 and 5. which screw cooperates with an arm 39 formed on the end of the rod. If a free closing of the door is required. the auxiliary cut-out portion 36 is in full register with the by-pass 37. If. however. the checking effect is to be accentuated, the rod is rotated by actuating the screw; 38. and less of the escape apertures are in register.

It will be seen that the opening movement of the check will be free and that the closing movement will be controlledby the extent of the cut-out portion 35. \Vhen. however. the piston reaches the point where the cut-out portion is no longer in action. the sole escape of liquid is controlled by the orifices 36. 37, and the degree of closing force may be regulated as desired. By the use of the valve such as described. we obviate packing and the use of small parts which may become corroded or worn. The openings which control the escape of fluid are flushed out at each actuation of the door and, therefore, will not become clogged. Obviously also the general construction of the check contains many points of advantage. particularly in assembling.

\Ve claim:

1. In a doorcheck, the combination of a casing, an actuating stem mounted in said casing, a cylinder having threaded engagement with said casing, a piston mounted in said cylinder. a rigid piston stein secured to the piston having means for engagement with said actuating stem whereby said piston is reciprocated. said piston stem at its rear end being enlarged and fitted closely to the side and bottom walls of said casing. Whereby said piston stem is guided in its reciprocation. substantially as described.

2. In a door check, the combination of a casing having an open end and an open side. a cylinder screwed into the open end of the casing. an operating stem mountedin said casing and adapted to be entered through the opening in the' side of said casing. a piston mounted in said cylinder. :1 piston rod secured to the piston and rigid throughout its length. said piston rod being enlarged at its point of engagement with said casing. whereby the sides thereof engage the sides of the casing. and said rodbeing provided with a foot portion engaging the floor of said casing. whereby said rod is guided by nd caused to move in a straight line in 4 casing. substantially as described.

Signed at Danville, Illinois, this 27th day of March, 1915.

AXEL H. LONBOM. GEOR irE R. RODGERS.

iVitnesses:

J. R. PERRY, Jonx Bnazums'rna.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner at Patentl,

. Washington, D. 0. 

